Phonograph record resurfacing machine



Feb. 11, R, M SQMERS 2,231,096

PHONOGRAPH RECORD RESURFACING MACHINE Filed Aug. 16, 1939 4 Sheets-Sheet l www Feb. 11, 1941. R M SQMERS 2,231,096

PHONOGRAPH RECORD RESURFACING MACHINE 4 Sheets-Sheet 2 Y r wir "V Slmcntor czam, M'. Somers 5 Gttornel` Feb. 11, 1941. R. M. SOMERS P HoNoGnAPH RECORD RESURFACING MACHINE NNN.

c-Filed Augmle, 1939 Cttorncg Feb. 11, 1941. R M SOMERS 2,231,096

PHONOGRAPH RECORD RESURFACING MACHINE Filed Aug. 16, 1959 4 sheets-sheet 4 Snoentor Rickard M eomers BB Ms? 08444.4- La.

Cttorneg Patented Feb. 11, 1941 rnoNoGnArH ariooianI RESURFACING MACHINE Richard M; Somers, West Orange, N. J., assigner to Thomas A.

Edison, Incorporated, West Grange, N. J., corporation of New Jersey Application August 16, 1939, Serial No. 290,370

22 Claims.l (Cl. S32-1.1)

This invention relates to machines for resur` facing phonograph records, and more particularly to means for improving the operation and control of such machines. In some respects the invention has certain features in common with thoserdis- A closed in my pending patent applications Serial Nos. 215,948 and 232,766, respectively led on June 25, 1938, and October 1, 1938, and each entitled Phonograph record shaving machines 2(which applications have issued into Patents Nos. `2,184,365 and 2,209,893, respectively. While the invention is 'shown and described in connection with machines for resurfacing records such as are used in commercial phonographs, `or in dic- ,tating machines, no unnecessary Vlimitation of my invention to this type of record resurfacing ma- `chine is intended.

Phonograph record resurfacing machines of the type just mentioned usually comprise a record-supporting mandrel, an openable and closetion, and a resurfacing tool on the carriage settable into operative position relative to the record. The carriage is driven forwardly during the operation of the machine and is `freely movable manually along the record when it is in an upwardly tilted position, the upward Atilting of the path), and manually returning the carriage tostart position. A record resurfacing will then be effected upon next putting the machine into operation to cause mandrel rotation and a con` current driving of the carriage along the mandrel.

`At the completion of the `record resurfacing the machine is stopped, the endgate opened, vand 'the record removed from the mandrel by means of a suitable record ejector.

It is an object of my invention to partially prepare the machine for a subsequent record resurfacing as an incident to the'removal of a record from the'machine. I It is another object of my invention to automatically further the preparation of the machine for a record resurfacing vas an incident to the mounting on the machine of the record to be resurfaced.

A feature of my invention is to effect both an upward tilting and a partial return of the carriage and also a latching of the carriage in its 5 upwardly tilted position as an incident to the ejection of a record from the machine.

"A further feature of my invention is to cause the `tool to be released from its previouslyset positionand the' carriage to be thereafter unlatched from its upwardly tilted position as an incident to the operation of mounting a record on the machine.

It is another object of my invention to provide stroboscopic means by which the operator is enabled to observe the surface of the record during a record resurfacing operation.

It is a further object of my invention to provide signalling means mutually controlled by a plurality of the operating parts of the machine for indicating when the machine is in and' out of condition for operation. Other and allied objects and features of my invention will more fully appear from the following description and the appended claims. l

Inl the description of my invention reference is had to the accompanying drawings, of which Figure 1 is a top plan View of a phonograph record resurfacing machine incorporating my invention; V

Figure 2 is a vertical section view taken substantially along the line 2-2 of Figure 1;

Figure 3 is a horizontal sectional view taken substantially along the line 3`3 of Figure 2;

Figure 4 is a fragmentary View, partly in section on line 4 4 of Figure 1 and showing, in elevation, details of an interlinkage system controlled by the endgate;

Figure 5 is a fragmentary view, Partly in section along the line '5--5 of Figure 4 and showing the interlinkage system, abovementioned, in plan view;

' Figure 6 is a front View, partlyin section, showing in` elevation mechanism controlled by the record ejector for operating the tool-carriage;

`Figure 7 is a'fragmentary view of the mechanism of Figure 6 taken substantially along the line 1--1 of that figure;

Figure 8 is a bottom View of a portion of the mechanism of Figure '7; and

f Figure 9 is a diagrammatic vIeW of mechanism and circuits in accordance with my invention.

Reference being had to Figures 1 and 2, there willbe seen a phonograph record shaving machine having a base plate I which supports forV a accrocs This endgate is provided with a .shaft 9'which isy journalled in a boss Il! extending'up from the base plate (see Figur-e 4) The endgate is releasably held in a closed position by an endgate bolt or latch II provided with a shaft `I2 (see FigureY 6) which is journalled in the right end portion I3 of a guide rail I3, which guide rail extends along the mandrel 2 forwardly thereof.' With thisv arrangement the bearing 5 maybe moved-free of. the right end of the mandrel byan openingfof the endgate, thereby permitting areco/rd to` be mounted on, and removed from, the mandrel. When the endgate is open the shaft 4I`s"inter` mediately supported by a standard I4, through which the shaft freely passes, and is retained in engagement with the thrust bearing 5 by the contact cfa collar I5 on the shaft 4 with the left side of'tlie'standard I 4.

The removal'o'f la record from the mandrel is performed by a record'ejector comprising a member I6 in the form of a bell crank, having a leftwardly extending handle I'I and an upright arm I8' carrying a shoe I3 located at the left of the record. The member I6 is pivoted on a Ishaft 2D, carried at one end by the guide rail I3 and at the :other end by the standard I4, and is biased into inoperative position, defined by the contact o-f the handle I'I`with the base plate, by -a torsional spring 2I yconstrained at one end by the base plate and at the otherV end by the handle I 1. To operate the ejector the handle I'I is raised to move the shoe I9 into contact with the record so as to` thereby push the record from the mandrel.

Supported by the base plate (through the standard 'I and another standard 22) is a cross rod 2'3 on which there is slidably and tiltably mounted a carriage 24 carrying a resurfacing tool 25. 'Ihe carriage has a long sleeve 24 embracing the rod and an arm 26 extending forwardly over the mandrel and'terminating in a shoe 25' which slidably rests on the, guide rail I3. The tool 25 is movably mounted o-n the carriage for movement towardsand away fromthe record. When the tool is setin operative position-a position in which the tool engages the record-, a rotation of the record and a concurrent feeding of the carriage along the record (as from a start to a terminalposition respectively at the right and left ends of the record) will cause a surface layer of the record to be cut away, this surface layer being directed from the tool, by a chute 55, downwardly through an opening 56 in the base plate. Such feeding of the carriage is effected by a feed rscrew 21 rotatably supported at one end by the standard 'I and at the other end by a standard 28. This feed screw is adapted to be driven coordinately with a rotation of the mandrel shaft 4 by means of a belt coupling comprising a, pulley 29 on the feed screw and a pulley 30 on the mandrel shaft. The coupling of the carriage 24 with the feed screw 27 is effected by means of a feed nut 3I carried by a resilient arm 32 extending rearwardly of the carriage sleeve 24. When the carriage is in normal operative Vposition--a position of the carriage when the arm 26 is'resting on the guide rail I3-the feed nut 3| is urged upwardly into Contact with the feed screw 21.

However, as the carriage arm is raised (which raising is limited by the contact of a post 33 on the carriage with a ridge 34 on the base plate) the feed nut 3I is moved downwardly out of engagement with the feed scr-ew and the resurfacing tool is also raised from the record so as to render the carriage freely manually movable along the mandrel. In the use of the machine the carriage is driven or fed in a leftward direction to its terminal position and is manually returned in a rghtward direction to its start position.

Rotation of the mandrel shaft 4 may be effected Iby asuitable electrical motor M, diagrammatically shown in Figure 9, which may be 1ocated beneath the base plate and be coupled by a belt (not shown) to a pulley 35 on the mandrel shaft, the base plate having an opening 36 throughwhich the belt may pass. The motor M is providedwith a power supply circuit 31 adapted to y makeeonnection'- with a suitable source of power by wayfofaf-plug 38; The motor is controlled by" meansof an openable and closeable switch-39', preferably o f-` the toggle variety, which is serially'conne'cted in the circuit' 3T and mounted on the"l base y plate inthe yforward right-hand portion-thereofL as shown` in Figure 1, the switch 3 9 having angarm 39' manipulatable to open and close thejrcircuit 31.

The-resurfacing tool 25'I comprises a knife bar 4ll-carrying a knife blade 4Ik at the inner end thereof; The knife bar 4B is slidably supported by an extension- 42; providedv on the right' side ofthefcarriage atl apoint directly'above'the carriage'rod 23; for radial movement relative to the record. The-meansI for controlling the knife bar to set the tool into operative position and to release the tool from a'set or operative position may be.4 ofa' construction such as is disclosed in Brown Patent No. 2,137,383, issued November 22, 1938, and entitled"R'ecord shaving machine. In this constructionthe knife bar' 40 is biased away from the record', and,y in the setting of the tool, is yieldablymovedtowards the record to bring the knife blade into engagement therewith, the knife bar being then' locked inV such position. To rel lease thetof'ol the knife bar is merely unlocked.

VA means'for.so'controlling the tool comprises a cap'4'3 secured.` to a guide rod 44whch passes slidably through thelextension 42 in a direction paralleli to tli'eknife bar. The knife bar 40 eX- tends" upwardly through theV cap 43 and terminates in a head 45. When `the cap is moved upwardly it contacts the head 45 to move the tool away from the record into inoperative' position defined by the contactof a collar 48 on the knife bar with the underside of the extension 42. The resurfacing tool is normally held in inoperative positionmby means of a compression spring 4'I coiled aboutthe guiderod between the cap 43 and extension 42 to urge the'cap 43 upwardly. To place the tool into operative position the knife bar is yieldably moved towards the record to press the knife blade 4I into engagement therewith. This is doneby pressing the cap 43 downwardly, such downward movement of the cap causing the tool to be yieldably moved therewith by means of a compression spring '46 coiled about the knife bar between a shoulder 4B on the bar and the cap 43.

The means' for moving the cap downwardly to bring the tool into operative position relative to the record comprises a lever 49 which is pivoted as at 50' to theright side of the extension 42. This lever is coupled by a link 5I to the cap 43 one end or the being pivoted by a pin sz rca short arm 53 of the lever 49 and the other end of the link 5I having a slot and screw connection 54 with the side of the cap 43. As the lever 49 is moved in a counterclockwise direction the tool is set into operative position relative to the record, the tool being rst moved towards the record into operative position by the cap 43 and being then locked in its operative position by a lock 55such as is described in the -abovementioned Brown patent. The terminal position of the lever 49, the position which the lever occupies in Figure 2, is dened by the impingement of the link 5 I against the hub 49 of the lever 49. When the lever is in this terminal position the pivot pin 52 is slightly past dead center with respect to the pivot axes of the lever 49 and of the connection 54. The lever 49 is then urged towards, and is. thereby releasably held in, its terminal position by Areason of vthe upward biasing of the cap 43. When the lever' 49 is, however, trippedi, e., moved slightly out of its terminal position to return the pin 52 across the dead-center line abovementioned-the upward biasing of the cap 43 will cause the tool to be first unlocked, by the clockwise turning of the lever 49, and to be thereafter returned to ino-perative position.

The above-described structure and mechanism are common to record shaving machines heretofore manufactured and used, and forma part of the present invention only insofar as they are re-` lated to or combin-ed with other mechanism hereinafter described.

At the completion of a record resurfacing operation the carriage occupies its terminal position and the resurfacing tool its set position. To next prepare the machine for another record resurfacing operation the resurfacing tool is reset and the carriage is returned to its start position. This resetting of the tool is done when the carriage is in an intermedi-ate position wherein the tool overlies the record, and involves releasing the tool from. its previously set position, partially returning the carriage from its terminal position, and then setting the tool. When the tool has been set the carriage may be fully returned to start position. In accordance with `my invention the preparation of the machine for a record resurfacing operation is partially effected as an incident to a change of record on the machine, the carriage being partially returned by the ejection of a record from the mandrel 2 and the resurfacing tool 25 being released from its previously set position by the closing of the endgate 8. However, in order that the set ytool may not interfere with a change of record on the machine while the carriage is in a partially returned position, the carriage is tilted upwardly before it is partially returned and is latched in such upwardly tilted position until the tool is released.

The means for tilting and partially returning the carriage, is operated by the record ejector and is shown in Figures 1, 6 and '7. This means comprises a. bar 51 which is extended along the guide rail I3 at a level just below the upper edge thereof and which is supported by a pair of left and right angular levers 58 and 59 pivoted by the respective screws 66 and 6l to the rearward wall of the guide rail. The levers 58 and 59 are each connected by a screw and slot connection to the bar'51, the levers respectively carrying headed screws Si! and E3 which respectively pass through `slots 62 and 63 provided in the bar 51 longitudinally thereof.

The lower end portions 58' and 59 of the levers 58 and 59 are extended downwardly through respective openings 64 and 65 in the base plate and are pivot'ally connected by respective .pins 66 and 61 to a bar 68 extending laterally of the machine below the base plate. By reason of the levers 58 and 59 being interconnected by the bar 68, the levers are caused to move in Xed angular relation to each other. Thus when the levers 58 and 59 are turned in a clockwise direction from their unoperated positions-the positions they occupy in Figure 6-the bar 51 is moved upwardly above the guide rail in parallel relation to the upper edge thereof. This upward movement of the bar causes the carriage to be tilted upwardly by reason of the contact of the bar with the carriage shoe 26. In order that the bar will be restricted rto straight up and down movement, it is provided with a downwardly extending arm 69 having ya vertical slot 19 which embraces the screw 60 on which thel lever 58 is pivoted.

The bar 51 is normally held by its own weight in its downward or unoperated position, defined by the contact of the screw 50 with the upper end of the slot 10, and the bar 68 is thereby normally retained in its most rightward position. In order that an operation of the record ejector will cause the bar 51 to be raised to tilt the carriage the record ejector is provided with a finger H which extends downwardly through an opening 12 inthe base plate to terminate at a point directly to the right of a cross pin 13 carried by the bar 68. When the record ejector is operatedi. e., turned in a clockwise direction-the finger 1I impinges against the pin 13 to move the bar 58 leftwardly, thereby causing a raising of the bar 51.` In the normal use of the machine the carriage will be in its terminal position, shown in dash-dot lines in Figure 6, when the record ejector is operated. In order that the carriage will be partially returned by the operation of the record ejector there is provided on the handle Il an upstanding arm 14. As the ejector is operated the arm 14 irnpnges against the left side ofthe carriage shoe 26 to return the carriage, the arm 14 being, however, so positioned relative tothe carriage that it will not Contact the shoe 26 until the carriage has been tilted suiiciently to disengage the feed nut 3l from the feed screw 21.

In order that the carriage will be retained in its upwardly tilted position when it has been partially returned by the record ejector there is provided means to latch the bar 68 in its leftward or operated position. This latching means is shown in Figures 6, 7 and 8 and comprises a, pawl 15 having a pair of turned-over ears 16 pivoted by a pin 11 on a pair of ears 18 turned over from the bar 68. The right end portion ofthe pawl 15 terminates in a pair of upper and lower fingers 15 and 15 of which the linger 15 is involved in the latching of the carriage and the finger l5 in its unlatching, as is later described. 'Ihe finger 15 is biased into contact with a stop member 19 projecting down from the base plate, the biasing being effected by a compression spring 6!) coiled about an arm 8| bent over from the pawl and projecting through'an opening 82 in the bar 58. When the bar 68 is moved into its leftward position the finger 15', however, slides off from the stop member 'l9 and is snapped inwardly by the spring 8D to latch the bar, the inward movement of the pawl being limited by the contact of a lug 8|' on the arm 8| with the bar 68. 'I'hus when the record ejector is operated the carriage is not only tilted upwardly and par- The operation'wof mounting arecord on theA machineinvolves-i` placing a vrecord onI the mandrel 42, closing the endgate and then latchingth'e endgatey in its closed position.: In accordance with-my invention the resurfacingtool is vreleased from set position and the carriage is thereafter unlatched from its upwardly tilted position as an incident to the mounting of a record on the ma.- chine. These operations may be conveniently effected by causing' the tool to bereleasedby the closing Vof the endgate and the carriage'to beunlatched bythe latching of the endgate in closed position.

The means for'releasing theftool by the closingy of the endgate is shown in Figures 1, 2,'3 yand 4 and comprises a laterally extending bar 83fsupported below the-base plate just within thel rearward edge of the opening-56 by means of a pair of left and right links 84 and 85 each pivotally connected to the bar 83 by the respective pins 86 and-8l and to the base plate by the respective screws 38 and 89. The bar 89 is thus permitted to move, with a swingingl motion, forwardly and rearwardly in'parallel relation to the mandrel 2. The rearward movement of the bar is limited by the contact of a stop lug 99 on the link 85 with the rearward edge of the bar 83; normally, the barv is held in Contact with the stop lug 9|] by means of a tension spring 9| connected to the link 8d. Operatively connecting the bar 83 with the resurfacing tool is a lever 92 pivoted to the right side of the carriage on a relatively long shoulder screw 93. This lever has a lower Vertical portion 94 which slidably contacts the front edge of thebarv 93, a central semi-circular portion 95 curved about the carriage rod 23 rearwardly thereof and pivoted vat its upper end on the shoulder screw 93 adjacently of the right side of the carriage, a bail portion 95 extending along the screw 99, and a forwardly extending arm portion 97| pivoted on the outer end of the screw 93 and terminating at a point directly below the short arm E3 of the tool-controlling lever 49, as is shown in Figure 2. Thus as the bar 83 is moved forwardly the lever 92 is turned in a clockwise direction t'o cause its arm portion 91 to be moved upwardly. As the arm portion 91 is so moved it impinges upon the underside of the short arm 53 to move the tool-controlling lever 49 in a clockwise direction, thereby tripping the lever to cause the release of the resurfacing tool.

A forward movement of the bar 83, such as is required to effect the release of the resurfacing tool, is caused by the closing of the endgate. The means coupling the bar 83 with the endgate comprises a short lever 98 pivoted by a screw 99 to a boss |99 extending down from the base plate. The lever 93 extends forwardly from its axis and terminates in a pair of leftand right lingers |0| and m2. The rightward linger |92 is'slightly longer than the finger ||l| and is also offset upwardly, as at |92', so as to be disposed at a level slightly above the finger ||l`|. Provided on-the bar 83 to the right of the nger |9| is a short vertical pin |23 which terminates at a point slightly below the level of the nger |92. 'I'he linger. |Ei| is normally held in contact with the pi-n |33 'by means of a tension -spring |04-which urges the` lever 99 rightwardly. Whilethe spring lillthusu-rges the bar 83'rightwardly this spring is notmade sufficiently strong to overcome the blias onthe bar as provided bythe'spring 9|.

When'th'efendgate is Vopened a shorts vertical pin |95; carriedbyr acollar |06 on the shaft 9 oftheiendgate at thelevel of the finger |92, impinges-against the finger |92 and moves the finger |02 before it out of its path against the biasing of-'the spring IM, the lever 98 snapping back until the finger ||l| impinges against the pin |63 when the pin |95 has cleared the finger |92. When the endgate is next closed the pin |95 impinges) against the finger |92 to move the lever 98 rightwardly in a, counter-clockwise direction. This movement of the lever 98 causes, by the contact ofthe finger ||l| withv the pin |03, the bar 83 to be moved rightwardly, thereby effecting the release-of the resurfacing tool from set or operative position.

When the endgate is closed the resurfacing tool isy released, as above explained, and then in the terminal movement ofthe endgate the pin |05 is movedfree of the linger |92 to thereby permit the mechanism coupling the endgate with the resurfacing tool to be restored, by the spring 9|,

to unoperated position. For convenience of op-- eration theendgate may beA suitably biased into open. position as by means of a torsional spring |97 coiled about the shaft 9 within a recess |98 in the base plate (see Figure Ll), which spring may be hooked at one end on the base plate and at the other end on the collar |96 as shown.

The means for unlatching the carriage from its upwardly tilted position by the latching of the endgate in closed position is shown in Figures 6, 7 and 8, and comprises a disk |99 which is secured to the lower end portion of the shaft I2 for the endgate latch Pivoted by a screw ||0 to the lower face of the disk |99 is a pawl which is biased in a clockwise direction, as it appears in'. Figure '7, against a stop pin ||2 on the disk by means of a tension spring ||3 connected between the pawll and the disk. When vthe endgate latch is in operative position the pawl is in the position it occupies in Figures 7 and 8. When the carriage is latched in its upwardly tilted' position by the operation of the record ejector the finger l5 of the pawl 15 is moved into the position shown in dash-dot lines in Figure 7, which position of the finger is directly to the left of the position occupied by the tip of the pawl when the endgate latch is in operative position. A movement of the endgate latch to inoperative position will then cause the pawl to snap over the finger l5, but normally this snappingof the pawl over the finger l5 will not occur since the endgate will be usually unlatched before the record ejector is operated. However, when the endgate latch is returned to operative position the pawl will impinge against the finger i5 to release the finger 15 of the pawl 'I5 from the stopping member T9, thereby causing the carriage to be unlatched from its upwardly tilted position.

With the above described mechanism it is seen that the carriage is partially returned and the resurfacing tool is released from set position as an incident to a change of record on the machine. Thus at the completion of the mounting of a record on the machine the operator need only to manipulate 'the lever 49" to set the resurfacing tool and then to return the carriage to start position in order to place the machine in condition fora record resurfacing operation.

Itis an additional feature of my invention to provide a stroboscopic lamp which is directed upon the surface of the record to be resurfaced an'dwhich is ashed at a frequency controlled in predetermined relation .to the rate of record rotation so as to produce the visual effect of a Y ent rotation of the record enables the operator slowly rotating record. By this means the record surface may be observed during a record resursired degree of record smoothness.

may be mounted within a recess provided in the underside of the carriage arm 26 as is shown in Figures 1 and 2, the mounting for the light comprising a socket ||6 supported by a bracket ||1 secured to the carriage arm. 'I'he circuit for the lamp comprises a two-wire cable ||8 leading from the light through an opening I I9 in the carriage (see Figure 2) to make connection across the motor M as shown in Figure 9, the lamp I4 thus deriving its power by way of the power supply circuit 31 for the motor and through the motor control switch 39 heretofore described.

Serially included in a lead H8' of the cable ||8 is a circuit interrupter |20 diagrammatically shown in Figure 9. The mechanism of lthe interrupter is shown in Figures 2 and 3, and comprises a -disk |2| made of insulating material, such as Bakelite, and having a metal hub |22 pivoted by a shoulder screw |23 to a bracket |24 secured to the underside of the base plate at a point below the mandrel. 'Ihe disk |2| is provided with gear teeth |25 on its periphery which mesh with a drive gear |26 provided on the right side of the pulley 35. Embedded in the right face of the disk |2| isv a radially extending bar |21 of suitable conducting material, and slidably contacting this face of the disk is a pair of electrical brushes |28 and |28. These brushes are supported by a frame |29 made of insulating material and held by screws |30 to a bracket 3| which in turn is secured to the underside of the base plate. The frame |29 is provided with a pair of openings |32 and 32' in which the brushes |28 and |28 are respectively disposed. The openings 32 and |32 `are respectively provided with screw plugs |33 and |33 and interposed between the brushes |28 and |28' and the respective plugs |33 and |33 are compression springs |34 and |34. These springs bias the brushes into contact with the right face of the disk |2| and also provided an electrical connection from the brushes |28 and |28 to the respective plugs |33 and |33. The plugs |33 and |33 are serially connected in the lead wire ||8' of the cable ||8 as shown in Figure 9.

In the mechanism just described it is seen that an electrical connection is momentarily made between the brushes |28 and |28', by way of the bar |21, during each revolution of the disk 2| `the making of this connection serving to connect the lamp 4 with the power supply circuit 31. When the motor M is in operation the disk |2| is rotated by the motor to cause a flashing of the lamp ||4. In order that this flashing may produce the eiTect of a slowly rotating record the effective diameter of the disk |2| is made slightly larger, say 1 per cent, than the effective diameter of the gear |26. Thus the disk L|2| will be rotated at a rate 1% slower than that of the record rotation and the lamp 4 will be flashed at a rate 1% slower than the rate of record rotation, thereby giving the visual effect of a rate of rotation of the record which is 1% of its actual rate. For a rate of record rotation of 1800 R. P. M.- which is the usua1 rate during a record resurfacing-the apparent rate of record rotation Will then be I8 R. P. M. This relatively slow appar- When the machine is in condition for operation the carriage rests on the guide rail I3 at its start position, the endgate is closed and the resurfacing tool is set into operative position relative to the record. Thus the signalling means may be appropriately controlled by thecarriage, both in respect of its tilting and of its movement along the record, by the endgate and by the resurfacing tool. While, in the illustration of my invention, the'signalling means is shown as being jointly controlled by the parts of the machine abovementioned, it will be understood that the control of l the signalling means need not necessarily involve all of these parts of the machine or be limited to these parts, since my invention contemplates a signalling means mutually controlled by a plur ality of the manipulatable parts of the machine in away such that each of these manipulatable parts must be in their respective operative positions before the signalling means will indicate that the machine is in condition for operation, and such that the placing of any one of these manipulatable parts into its inoperative position Will cause the signalling means to indicate that the machine is out of condition for operation.

The signalling means may comprise a pair of lamps |35 and |36 respectively mounted beneath green and red colored windows |31 and |38 pro- `vided inthe base plate as shown in Figure 1.

The lamps |35 and |36 may receive their Vpower by way of the power supply circuit 31 and be controlled so that the lamp |35 is operated to provideV a green light-a go indication-when the machine is in condition for operation and so that the lamp |36 is operated to provide a red light-a stop indication-when the machine is out of condition for operation. The control lmanipulatable parts of the machine, as is hereinafter described.

The switch |39 is mounted on top ofthe base plate in theV rearward right-hand portion thereof and is shown in detail in Figures 1 and 2. This` switch has a frame |43 comprising a stack |44 insulatedly supporting, in cantilever fashion, right and left pairs |45 and |46 of upper and lower contact springs, and an intermediate shorting or pole member |41. The pole member |41 is biased leftwardly into contact with the pair of contact springs |46`to connect these contact springs together, and is movable against its biasing to thereby open the pair of contact springs' |46 and to close the pair of contactsprings |45. The pole member |41 is controlled by way of an operating arm |39 of suitable insulating material which is mounted on the pole member and extended outwardly of the frame |43.

The switches |40-, |4| and |42, being similar to the switch |39, are sufficiently illustrated by a diagrammatic showing thereof. These switches, as they appear in Figure 9, are respectively provided with rightward pairs of contacts |49, |59

and |5| with leftward pairs of contacts |52, |53f |56,-and-| 51. AThe fpole; members |55, |56,;fand |51 are Ybiased 'leftwardly into;contactgwith the leftward pairsofmcontacts |52, |53, and |54,-re spectively, and are movable against their;` biasing to connect together therrightward vpairszof. contacts |49, |50, and respectively. :Provided on the pole members |55, |56 and |51, respectively, lare voperating arms ;|40, |4| and |42', fsuch as the operating arm |39 of the switch |39,

as showninFigure 1.

The switch y|39jis controlled'by the movement yof the carriage 24 into andoutof` start position. When the-carriage is movedrintostart position a stud |58, threaded into the V-postV 33 Y of thecarriage and locked inplace yby the locknuts |58', fimpingeseagainstthe operatingrarm |39 ofthe switch` |39 to :move the :Dole `imember |41 v rightwardly,j thereby. closing; the fpair: of contacts |45 ftofeachfother. .Whenpthe carriage is movedfout -of startrposition the reverseactiontakes place: the; pair f of contacts |45 ,being opened and the ipairgofcontacts |,46fbeing closed by reason ofthe biasing of the pole-member |41.

' Thel switch |40 ismounted on; the underside of the-basesplate :and lcontrolled :with respect to the t-iltingofy the carriage. Whenl the carriage is resting on the guiderail the bar68'is in sitsfmost i itsbiasng; intoposition to-closethe pair of contacts- |52. Thus/when the carriage-.is tilted upwardlyby'th'e:Y ejector, or latched in its upwardly tilted*y positionaas heretofore VVexplained, the :pair

of contacts |-52;are. closed, but whenthe carriage isfree'to rest .onftheguide rail the'pair of'con- '-tacts' |49 are closed.

iTheswitch' |4| is mounted non' the underside of the base :plate in the rearward right-hand por- `tionthereofI and is controlled bythe opening and ,closing ofgthe. endgate. kThe means connecting .the endgate 8 with .the-switch |4| comprises a lever: lpivoted on the screw 99. The forward end |60 of the lever |60 terminates in an open slot f|6| .which is engaged by a vertical pin' |62 carried by the collar |06. When the endgate is closed theswitch armv |4|' is held out of biased position vby its contact with the rearward end portion |60" of the lever |60, the pair-of contacts |50ofltheswitch'being then closed. However, when-the-endgate is opened the lever |60 is movedfree'from the switch arm |4| to permit the-pole member |56 of the switch |4| to be moved,1 byreason of its biasing, into position to close the pair of contacts |53. Thus the pairs of contacts |53 and |50fare respectively closed by the-:opening .and closing of the endgates.

The switchal42 is mounted on the carriage and is controlled .by the resurfacing tool. When `the V:tool is in inoperative position thefswitch |42 is in its biased position, thegpair of contacts |54 being then closed. However, as 'the resurfacing .tool is Lset into- ,operative position a finger |63 2mounte'dpnthe capf43.impingesagainst the operatingar1n- |142 of vthe switch tomove the pole Y member |51 `so as to AcloseV the `pair of contacts 75y .|5|. Thus the .pairs of contacts |54 and |5| and |54 ;;and witlrshorting, or polemembers |55,

f are respectively closedbyzthefzplacing of; the resurfacing toolintoginoperative: and operativey positions.

The lamp |35, which provides the green light, has a terminal |35' connected by a conductor |64 directlyto-one side of the power supply cirfcuit 31. The other terminal |35l of the lamp |354 is connected to the other side of the power supply circuit 31 by way of a conductor |65 which'serially includes the pairs of contacts |45, |49, |50 and |5| of the switches |39, |40, |4| and f |42 respectivelywhich pairs of A contacts are respectively closed when the respective switches are out of their biased position. Since these switches are. each `maintained out of their .biased positions, las above explained, only when the carriage is in startposition and free to rest upon the guide-rail, theendgate is closed `and .the resurfacing tool is set inoperative position, the lamp |35 is closed to its power source to produce a green light only when the machine is in condition' for operation.

The lamp |36, which provides the red light, fhas a terminal |36 which is also connected by the conductor |64 directly to one side of the power supply circuit 31. The other side of the powerA supp1y'circuit'31 is connected by way of a conductor |66 which serially includes a parallel connection of the pairs of contacts |46, |52, |53 and |54 of the switches |39, |40, |4| and |42, respectively-Which pairs of contacts are respectively closed when the respective switches are in theirbiased positions. Thus the lamp |36 is :closed to its source to provide a red light whenever anyone of the switches |39, |40, |4| and 42 is in its-biased position. Since one of these switches is placed in biased position when either the carriage is out of start position or latched in an upwardly tilted position, or the endgate is open, or the resurfacing tool is in inoperative position, a red light is always provided ywhen the machine is out of condition for operation.

`Although I have herein showed and described my invention in terms of a certain preferred ernbodiment it will be understood that this embodiment is merely illustrative of my invention and not limitative thereof as many changes and modifications may be made in this embodiment change of record on the machine, for causingv said carriage to be partially returned and said tool to' be released.

2. In a phonograph record resurfacing machinechavinga support Aon and from which a record may be mounted and removed: the combination of a movably mounted carriage capable of forward and return movements relative to said support; a resurfacingtool on said carriage settable` into operativeposition relative .to Aa sup- Aportedv record; `a member operated incidental to without departing from the scope of my inven-'I 50 and return movements relativeto said support;

the removal of a record from the machine; a

member operated incidental to the mounting of a record on the machine; and means, jointly controlled by said members, for Acausing said Carriage to be partially returned and said tool to be released incidental to a change of record on the machine.

3. In a phonograph record resurfacing machine having a support on and from which a record may be mounted and removed: the combination of a member moved incidental to the removal of a record from the machine; a tooloarriage movable along and tiltable upwardly from said support; a latch for holding said toolcarriage in an upwardly tilted position; and means, operatively connected with said member, for causing said carriage to be moved into said upwardly tilted position and to be subjected to 4. In a phonograph record resurfacing machine having a support on and from which a record may be mounted and removedfthe combination of a member moved incidental to the removal of a record from the machine; a movably mounted tool-carriage; driving means normally connected with said tool-carriage and disconnectable therefrom; a latch operable to maintain said tool-carriage disconnected from said driving means;v and means, controlled by said member, for causing said tool-carriage to be disconnected from said driving means and to be subjected to the action of said latch upon the removal of a record from the machine.

5. In a phonograph record resurfacing machine having a support on and from which a record may be mounted and removed: the combination of a member moved incidental to the removal of a record. from the machine; a tool-carriage capable of forward and return movements relative to said support and tiltable upwardly therefrom; a latch operable to releasably hold said tool-carriage in `an upwardly tilted position; and means, controlled by said member, for partially returning and upwardly tilting said carriage and for subjecting the same to the action of said latch, as an incident to the removal of a record from the machine.4

A6. In a phonograph record resurfacing machine having a support on and from which a record may be mounted and removed: the combination of a member moved incidental to the removal of a record from the machine; a toolcarriage capable of forward and return movements relative to said support; driving means; means for coupling said tool-carriage with said driving means, normally maintained in opera- `tive position and latchable in inoperative position; and means, controlled by said member, for causing said carriage to be partially returned and said coupling means to be latched into inoperative position.

'7. In a phonograph record resurfacing machine having a support for a record: the combination of a tool-carriage capable of forward and return movements relative to said support and tiltable upwardly therefrom; a latch for holding said tool-carriage in an upwardly tilted position; a record ejector; and means, controlled by said ejector, for partially returning and upwardly tilting said tool-carriage and subjecting the same to the action of said latch.

8. In a phonograph record resurfacing machine having a support for a record: the combination of a tool-carriage capable of forward driving means for said tool-carriage normally connected therewith and disconnectable therefrom; a latch operable to maintain said toolcarriage disconnected from said driving means; a record ejector; and means, operated incidental to the operation of said ejector, for causing said tool-carriage to be disconnected from said driving means and to be further partially returned and subjected -to the action of said latch.

9. In a phonograph record resurfacing machine having a support on and from which a record may be mountedand removed: the oombination of a carriage mounted for movement along said support and having normal and up-v wardly tilted angular positions; a resurfacing tool on said carriage settable into operative position relative to the record and releasable therefrom; means for upwardly tilting said carriage and thereafter latching the carriage in its tilted position as'an incident to record removal; and means, operated incidental to the mounting of a record on the machine, for releasing said resurfacing tool from set position and thereafter unlatching said carriage to permit its return to" `normal angular position.

10. In a phonograph record resurfacing machine having a support on and from which a record may be mounted and removed: the combination of a carriage capable of forward and return movements along said support and tiltable upwardly from a normal angular position; a resurfacing tool settable into operative position relative to the record and releasable therefrom; a latch for releasably holding said carriage in an upwardly tilted position; means, rendered effective incidental to record removal, for upwardly tilting and partially returning said carriage and for causing said latch to be rendered operative; and means, operated incidental to the mounting of a record on the machine, for releasing said tool from its set position and thereafter rendering said latch inoperative whereby to permit said carriage to return to normal angular position.

ll. In a phonograph record resurfacing machine having a support on and from which a record rmay be mounted and removed: the ccmbination vof a carriage slidably and tiltably mounted relative to said support; a resurfacing tool on said carriage settable into operative position relative to the record and releasable therefrom; a latch operable to releasably hold said carriage in an upwardly tilted position; means for causing said carriage to be tilted upwardly and said latch to be rendered operative upon the removal of a record from the machine; and means, operated as an incident to the operation of mounting a record on the machine, for releasing said tool from operative position and thereafter releasing said latch to permit the lowering of the carriage from its upwardly tilted position.

12. In a phonograph having a record-supportying mandrel: the combination of a resurfacing tool settable into operative position in relation to a record supported by said mandrel; an openable and closeable endgate for said mandrel; and means, operated by the closing of said endgate, for causing the return of the set tool to inoperative position.

13.` In a phonograph record resurfacing ma.- chine having a mandrel for supporting a record and an endgate for said mandrel; the combination of a tool-carriage tiltable relative to said carriage inan upwardly tiltedY positionya'latch -for said endgate; and means, .controlled by said `endgatelatch,.for lreleasing said tool-carriage latch.

.14.'In a phonograph record resurfacing machine having a mandrel for supporting a, record and an openable and closeable endgate for said kmandrel: the combination of a tiltably mounted tool-carriage latchable in an upwardly tilted position; a latch for holding said endgate in closed position; .and'meana controlled as an incident to vvan endgate for said mandrel:

the. latching of said endgate in closed position, for releasing said tool-carriage from its latched position.

closed position; and means for releasing one of said latches by the release ofthe other.

17. In a lphonograph record resurfacing machine having a mandrel on and from which a record Vmay be mounted and removed: the combination of a carriage capable of forward and return movements along said mandrel and tiltable upwardly therefrom; a resurfacing tool on said carriage .settable into and releasable from and operative position relative to the record; an openable and closeable endgate for said mandrel; a latch for holding said endgate in closed position; means for partially returning said carriage and latching the same in an upwardly tiltedposition as an incident to| the operation of removing a reco-rd from the machine; means for releasing l said tool from set position by the closing of said endgate; and means for unlatching said carriage by the movement of said endgate latch to operative position. Y

18. In a phonograph record resurfacing ma- Y chine: the combination ofv means for rotating a record; a stroboscopic lampior lighting the surface of the record; and means, controlled in predetermined relation to the rate of rotation of the record, for intermittently flashing said lamp to produce the visual eiect of a relatively slow rotation of the record, whereby to permit the operator to observe the effectiveness of a record vresurfacingduring the resurfacing operation.

: .mandrel a latch. for; rcleasablyholding; said t-ool- 5.19. lIn a phonograph record resurfacing ymachine: ithe combination of Ameans forrotating a record to 'be resurtaced; a stroboscopic lamp for lighting the surface of the record; a circuit for said lamp; and interrupting means for said circuit operated by said rotating means at a predetermined and different rate from the rate of record rotation, for hashing said lamp on the record, whereby to permit the operator to observe the record surface during a record resurfacing' operation.

20. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of an openableand closeable endgate for said mandrel; a carriage movable along' said mandrel between start and terminal positions; a resurfacing tool on the carriage settable into and releasable from an operative position relative to the record;- signalling means providing stop and go indications; and control-means, f

for said signalling means, jointly controlled by said endgate and carriage and resurfacing tool, for causing said signalling means to effectfa go indication onlywhensaid endgate is closed, said carriage is in start-positionland said resurfacing Vtool -is set.

21. In a phonograph record resurfacing machine having a record-supporting mandrel: the combination of a mechanism operable to resurface a record supported by said mandrel comprising a plurality of manipulatable parts, each of said partsl being adapted to be in respective predetermined positions yto placesaid mechanism in condition for operation; a .signallingsmeans providing stop and go indications; and switch means, operatvely'associated with said several manipulatable parts respectively and mutually controlling said signalling means, to cause the signalling means to effect go and stopindi `cations-when said mechanism is respectively in andout of condition for operation.

22. In a phonograph record resurfacing machine havng means for supporting a record to be resurfaced: the combination of a mechanism operable to effect a resurfacing of the recordl and,

comprising a .plurality of `parts each 'manipulated -inthe use of the machine, each of said parts being adapted to be in respective predetermined positions to place the machine vin vcondition for operation;.signalling means providing -stop1and go indications; switch means for said-.several manipulatable parts respectively each operated by the movement of its respective part intoand out of its said predetermined position; and'a circuit mutually connecting ksaidy several .switch-V means with said signalling means to causethe signalling means to eect go and stopfindications when the machine is'placed into and out of condition for operation.

RICHARD M. SOMERS.

p that the same may conform to the record of the case i CERTIFICATE OF CORRECTION.

patent No. 2,251,096. February 11, 19m.

RICHARD M. SOIVIERS.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring; correction as follows Page l, first line ll, for the patent number 2,209,895" read "2,209,855--g page column,

50,. for the word "provided" read --provide; and

5, first column, line ).19- that the said Letters Patent should be read with this correction n the Patent office therein signed and sealed this 8th day of April, A. D. 19111.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents. 

